The design of a broadcast receiver requires consideration of the type of antenna to be used such that the best performance of the system is maintained. In the past, the use of a built-in air loop antenna was common in the design of home receivers and some portables. However, the effectiveness of this type of antenna decreases with its decrease in dimensions. Today, with the widespread use of trans...
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It is desirable to use power transistors as switches up to their maximum collector-emitter voltage capability (BVcex). In this type operation, failure phenomena during switch-off have been observed and attributed in the literature to second breakdown, punch through, reach through, pinch off, and various types of energy level effects.
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This report describes a three-transistor d.c. coupled video amplifier. The low frequency gain, thermal stability., input impedance, frequency response, distortion, rise time and signal handling capability of the amplifier are discussed and the results of the measurements are given.
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Parametric amplifiers are distinguished from most active networks in that power is taken directly from an a-c source and that the phase of this source is significant in the amplification process. As a consequence of the harmonic spectrum produced by the interaction of the power source (pump) and the nonlinear element, the introduction of a small signal generates a pair of sidebands about each harm...
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OTL Power Amplifiers (See figure 1.) The basic types of configuration evolve around either complementary pairs, or the full or half-bridge configuration. The complementary circuit requires a split power supply and matched PNP-NPN power transistors. The practicalities in procuring germanium pairs in reasonably high power ratings exclude this circuit from consideration for the high-fidelity audio am...
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The Nuvistor small-signal tetrode, a modern and unique development in the design and manufacture of electron tubes, has great potential for use in the intermediate-frequency stages of new television receivers. The Nuvistor provides the circuit designer with a new tube capable of superior performance in this wideband amplifier application. In addition to its high figure of merit, the Nuvistor tetro...
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It has long been recognized that very low tracking forces in phonograph pickups will minimize wear of the record and styli. Another advantage of low tracking force is the reduction in wavelength loss. Two factors tend to place a limit on the minimum tracking force which can be used. One is the mechanical impedance of the pickup and the other is the stability of the pickup-tone arm system when subj...
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A solution is sought to the following problem: Given a wide bandwidth of the order of 50 kc, devise standards such that the entertainment value shall be maximized. Four applications are considered: tape recording at a tape speed of 15 inches per second; telephone conversation accompaniment over high-quality telephone lines; long-distance wire-line transmission over high quality telephone lines; an...
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Factors important to the design of a low radiation uhf television tuner have been empirically studied within the framework of the open field measuring technique specified by the FCC. Although there is some question as to the reliability of the open field method some significant results have been obtained. In particular it has been established that the magnitude of radiation is dependent on basic t...
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Due to the dependence of transistor small signal parameters on the dc operating point, the gain of a transistor amplifier is function of the emitter current Ie and of the collector voltage Vc. An analysis of the variation of the series-parallel transistor parameters hij with the operating point shows that the gain decreases with decreasing Ie or decreasing Vc in the region of small values of Ie an...
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A transistorized vertical deflection system has been developed to scan a 90-degree, 14-inch picture tube at 14 KV accelerating voltage. This system consists of two transistors in a common-emitter multivibrator to form a vertical oscillator, one transistor as a driver and one output transistor, and the system is supplied power from a 12-volt d-c source. To prevent decentering of the raster, due to ...
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